.topL {
  width: 20px;
  height: 20px;
  border-top-width: 2px;
  border-top-color: #26c6f0;
  border-top-style: solid;
  border-left-width: 2px;
  border-left-color: #26c6f0;
  border-left-style: solid;
  position: absolute;
  top: -2px;
  left: -2px;
}
.topR {
  width: 20px;
  height: 20px;
  border-top-width: 2px;
  border-top-color: #26c6f0;
  border-top-style: solid;
  border-right-width: 2px;
  border-right-color: #26c6f0;
  border-right-style: solid;
  position: absolute;
  top: -2px;
  right: -2px;
}
.bottomL {
  width: 20px;
  height: 20px;
  border-bottom-width: 2px;
  border-bottom-color: #26c6f0;
  border-bottom-style: solid;
  border-left-width: 2px;
  border-left-color: #26c6f0;
  border-left-style: solid;
  position: absolute;
  bottom: -2px;
  left: -2px;
}
.bottomR {
  width: 20px;
  height: 20px;
  border-bottom-width: 2px;
  border-bottom-color: #26c6f0;
  border-bottom-style: solid;
  border-right-width: 2px;
  border-right-color: #26c6f0;
  border-right-style: solid;
  position: absolute;
  bottom: -2px;
  right: -2px;
}
